Automatic starting and stopping attachment for disk-type talking machines



May l5, 1923.

'W. L. COWEN ET AL AUTOMATIC STARTING AND-STOPPING ATTACHMENT FOR DISK TYPE TALKING MACHINES Filed Dec. 15 1921 2 Sheets-Sheet 1 ZIZIZZ. COR/6'10 C. fl .1 13 v'ezod/ May 15, 1923.

w.. L. cowgm ET AL AUTOMATIC STARTING ANDYS'IOPPING ATTACHMENT FOR DISK TYPE TALKING MACHINES 2 Sheets-Sheet 2 Filed Dec.

, 6L4, 7Z1: den/ab 3 Tatented May 15, 1923.

"time a means ant Janina.

WALTER roonrr'anr cownn .enn orrvn ALFRED-FRIEND, or SYDNEY, new sonar:

, warns, AUSTRALIA, 'A'ssrenons TO LEOPOLD noaanr;or SYDNEY, new so'o'rn WALES, AUSTRALIA.

AUTOMATIC STAB/TING AND STOPPING ATTACHh LENT EOE DISK-TYPE TALKING" i laIACHINES.

Application filed December 15, 1921. Serial No. 522,693.

To all whom it may concern:

. Be it known that WVALTER Loonrmnr Con-n2; and Crane ALFRED F IEND. sulnects of the Kinoof Great Britain and Ireland, residing at ydney, New South Wales, Australia. have invented certain newand useful Improvements in Automatic Start1ng and Stopping Attachments for DlSk Type Talking Machines, of which the followlng is a specification. g I v a This invention relates 'to means for automatically starting the rotation of the table of a disk type talking mach ne and for arresting the rotation of thetable when the reproducer needle has attamed the final course of the record groove.

The attachment is located on the floor between the reproducer arm bearing andthe outer periphery of the rotating table carrying the disk record, and the attachment comprises a, mechanical device operated by the lateral movement of the reproducer arm and functioning to bring a spring controlled brake into engagement with the table mm.

The device consists of a plunger sl1dably mounted in fixed bearings and having on one end a shoe of leather, rubber or other frictional material. The plunger is controlled by a coil spring which normally acts to move the plunger outwards to bring the brake shoe into contact with the rim of the table. The plunger is moved in a rearward direction to release the brake shoe from contact with the table rim by means of a pawl depending from the reproducer arm neck which engages 'a helical slot formed at therear end of the sliding plunger. A hinged spring controlled detent engages with a slot formed in the side of plunger and holds the plunger in the rearward posi tion with the brake shoe clear of the table. The plunger is released by means of a striking finger attached to the neck of reproducer arm which engages the hinged detent when the reproducer arm has moved into a predetermined position and the brake shoe immediately comes into contact with the table rim, and stops the rotation of same.

But in order that the invention may be clearly understood reference will now be made to the drawings which accompany and form part of this complete s pecificationand in which.: I Figure 1 18 a perspective view showing the device 1n position wlth brake shoe 1n engagement with the table rim and the operatmg pawl in position ready to with draw the plunger.

' Figure 2 is a similar view showing the plunger withdrawn and striking finger about to engage the hinged detent. I

'Figure' isa perspective view of covering cap. 4

Figure. 4 is a perspective view of device, from the opposite angle. I

Figure 5 is a similar view to Figure 4 showing covering cap in position.

Figure 6 is a diagrammatic view illustrating the operation of the device.

' The plunger A is slidably mounted in bearings 7 and has on its forward end a friction brake shoe 8. The plunger. A is normally held in the forward position as shown in Figure 1 by the coil spring 9, and is moved rearwards by means of an operating pawl B which depends from a collar 10 which is clamped to the neck 11 of the reproducer arm 12. The pawl B is adapted on the lateral movement of the reproducer arm to engage a'helical slot 13 and move the plunger in the rearward directlon clear of engagement with the table 14. As soon as the plunger A has been I moved rearwards the hinged detent C springs into engagement with the notch 15 and holds the plunger in the rearward position. bearing plate 7 and abuts on one side against the plunger A and on the other against plate 17 with intermediate leaf spring 18. The device is secured to the fioorby screw studs 19 with adjusting nuts 20 and has a cover- The detent G is pivoted at 16 to.

ing cap 21 as shown in Figures 4 and5. vA

rotatable striking finger 22 is mounted on collar 10 in a position to engage the detent C in the manner hereinafter described.

The operation is as follows referring to Figure 6. In adjusting the stopping device the needle 23 on speaker 24 is placed in the finish groove 25 of disk record 26 and the striking finger 22 is rotated until it comes into contact with the detent O which is in its normal position. The reproducer arm is then swung back, the operating pawl 13 riding freely over the helical slot 13. The motor should then be wound up. In starting the machine the reproducer arm 12 should be brought forward in the ordinary manner and the needle 22 placed in the start groove 27 of record 26. In doing this, the operating pawl 13 engages the helical slot 13 and moves the plunger A rear-' ward thus releasing the brake and allowing the table to rotate, the plunger being held by the detent C. When theneedle is running in the finish groove the striking finger 22 comes into contact with the hinged detent C and releases the plunger and the brake shoe 8 engages stopsthe rotation of the table. 1

Y We claim Y a 1. An improved automatic starting and stopping attachment for disk type talking machines comprising a slidably mounted plunger having at one end a friction brake shoe and the other end a' helical groove, a

coil spring controlling said plunger, said plunger being provided with a notch, a

" pawl depending from the producer arm neck adapted to engage said helical groove, a

hinged spring controlled detent adapted to engage said notch and an adjustable finger attached to the reproducer arm and adapted to engage said detent substantially as and for the purpose herein set out. s V

2; An improved automatic starting and stopping attachment for disk type talking their signaturesin presence of two ,wit-

nesses. I

WALTER LOCK-HART COWEN, CLIVE ALFRED FRIEND. V Witnesses: T. C. ALLEN, Jr.,

. GLADY GARDNER. 

